So I finally built a tapped horn...

[Jay481985]

I seem to recall a certain someone defending himself a while back about
not having a digital camera... *cough* theear *cough* *cough*
[][][]





I have had yet another friend swing by and take pictures who is yet to
send them to me so I can post them. How lame is that? But really,
there's not that much to see....it's just a small wooden box sitting in
the corner of my room.





It's annoying really because I need to tear it apart anyway and brace
the crap outta everything. I considered doing the threaded rod through
the enclosure, but a tapped horn needs to be folded which means I would
need to go through 3 panels of wood - none of which are parallel to
each other. I simply don't have a drill bit that is 20" long. (Do they even exist?)

]

sure they do drwho, goto home depot

[TheEAR]

I seem to recall a certain someone defending himself a while back about not having a digital camera... *cough* theear *cough* *cough* [][][]

But just to brag a little bit....I have found that 23Hz doesn't trigger any of the resonances in the sub, which means I can crank that frequency as loud as my drivers can handle.....which results in over 130dB at the listening position [H]

I have no idea WHO you are talking about. [8-|]

These days the even throw cheap 2MP digi cams in cereal boxes. Heck even cell phones kids have have camera!! []

130dB at what frequency? I should maybe buy Danley Labs sub,looks like this approach gives tremendous results out of very ordinary drivers,and this is very good news for anyone looking for major output.

[darkside]

Did anyone ever figure out the PVC pipe mystery in the DTS-20? And yes,

you can buy a really long drill bit. I saw some at Fry's the other day.

[DrWho]

That's 130dB at 23Hz.

My phone actually has a camera but it sucks and I wanted halfway decent pictures... []

As far as the output, I wish I had the ability to measure distortion.

When you put your hand in front of the mouth you can feel a ton of wind

blowing. While I'm sure some of that is associated with insane output

at a low frequency, moving air is also a source of distortion. If you

crank up an inaudible frequency, you can hear a lot of chuffing - the

same sounds ports make when they chuff. Though it doesn't really come

into play until about 120dB or so, but I'd rather the horn itself not

be a restricting factor on the peak output.

[TheEAR]

My phone actually has a camera but it sucks and I wanted halfway decent pictures... []

Ah ha take a pic,even if it is half blurred. Just to see how the sub looks.

[DrWho]

Here's a pic where we've been doing all of our testing (since my sub amp is in a closet down the hall). I've got more pics of the internals and the build process, but I gotta get me friend to be unlame and get them to me [8o|]

[Jay481985]

is that a bookshelf?

[DrWho]

I suppose you could turn it into a bookshelf []

That's the sub.

[TheEAR]

No wonder you have panel vibration. This shape demands thicker walls and real deal bracing.

[darkside]

No wonder you have panel vibration. This shape demands thicker walls and real deal bracing.

Like I said......

Ear just wants to criticise your carpentry skills

[DrWho]

No wonder you have panel vibration. This shape demands thicker walls and real deal bracing.

There is no free radiating area larger than 6" with how the internal bracing works out. I have tracked down the resonant areas of the sub and it's mostly coming from the front panel, which isn't braced and only screwed in from the sides (no glue). I wanted to be able to take apart and obviously screws in the side of plywood are a no go. I'm intending to throw the sub away anyway so I think I'm not going to bother fixing it...the easy solution would just be a vertical brace down the middle running all the way to the bottom and then some 1x1 strips going down the sides so that I can mount it from the face isntead of from the sides.